fix: Enable Remove button for orphaned VDD displays, revert startup cleanup

fix: Add missing desktop receiver files — actualTcpPort, retry logic, mDNS port

fix: Windows sender always uses standard port 51820 for BetterCast receivers

fix: Clean up orphaned VDD displays on startup, fix retry race condition

fix: Add mDNS browse logging for receiver discovery debugging

fix: Add GDI fallback for capturing virtual displays

fix: Detect and auto-activate virtual displays that aren't extended

fix: Use devcon instead of pnputil to install VDD driver

fix: Auto-launch VDD Control.exe for named pipe display creation

fix: Auto-install VDD driver if files exist but driver not registered

fix: VDD path lookup failed because QCoreApplication didn't exist yet

fix: Bundle VDD files into portable artifact too

fix: Suppress mDNS log spam and add MttVDD detection

fix: Download VDD driver package instead of just control app

fix: Add verbose VDD detection logging and broaden search methods